The　stability　of　a　porous　seabed　under　wave　and　current　loadings　is　particularly　important　for　engineers　to　design　marine　structures　such　as　submarine　pipelines,　breakwaters,　and　offshore　platform　foundations.　Most　previous　investigations　of　dynamic　response　of　marine　structures　and　seabed　have　only　considered　the　influence　of　wave　loading,　but　the　important　influence　of　current　is　ignored.　Even　if　the　influence　of　current　is　considered,　the　interaction　mechanism　of　both　loadings　has　not　been　clearly　elaborated.　Based　on　the　Biot＇s　dynamic　theory　and　combined　two-dimensional　nonlinear　progressive　wave　and　uniform　current　theory,　the　interaction　mechanism　of　wave　and　current　loadings　and　the　influence　of　current　on　wave　characteristic　are　analyzed　by　numerical　computations.　The　influence　of　current　velocity,　different　permeability,　and　stratification　in　seabed　on　the　effective　stresses　and　pore　pressures　of　seabed　is　discussed　in　detail.　Further,　the　stability　of　seabed　is　evaluated　through　the　liquefaction　analysis　of　seabed,　which　will　provide　important　reference　frames　to　improve　the　design　and　construction　of　marine　structures.